In Fig. REF  (a) we have shown \(\ell \)  versus \(t\)  plots for several different compositions. For compositions at or close to the symmetric value, intermediate time behavior, over long periods, is linear, consistent with the expectation for viscous hydrodynamic growth. The saturations at late times are due to finite size of the systems. Late time behavior, for compositions far away from the critical value, is consistent with \(\alpha =1/3\) . This is expected for the BS [1]}, [2]}, [3]} mechanism, in \(d=3\) . For a more convincing confirmation, of the values of the exponent, we have calculated the instantaneous exponent [4]}, [5]}, [6]}, \(\alpha _i= \textrm {dln}{\ell }/\textrm {dln}{t}\) . This quantity is shown in Fig. REF (b), as a function of \(1/\ell \) . The convergences, in the \(\ell \rightarrow \infty \)  limit, to \(\alpha =1\)  and \(\alpha =1/3\) , can be appreciated.
For \(\ell <\infty \) , smaller values of \(\alpha _i\) , compared to the expected ones, can be attributed to the presence of non-zero offsets at the beginning of a scaling regime. If such initial length has a value \(\ell _0\) , \(\alpha _i\)  is expected to exhibit the behavior [4]}, [6]}
\(\alpha _i=\alpha \left[1-\frac{\ell _0}{\ell }\right].\) 
